-
smaller than milli- are
useful in
measuring extremely small angles.
Microradians (μrad, 10−6 rad) and
nanoradians (nrad, 10−9 rad) are used in astronomy...
-
theodolite position.
These angles can be
measured with
accuracies down to
microradians or
seconds of arc. From
these readings a plan can be drawn, or objects...
-
visual autocollimator can
measure angles as
small as 1
arcsecond (4.85
microradians),
while an
electronic autocollimator can have up to 100
times more resolution...
- The
human naked eye has an
angular resolution of
approximately 280
microradians (μrad) (approx 0.016° or 1
minute of arc), and the ISS
targets an altitude...
-
pointing stability is
within 50
microradians over one second, and post-processing
attitude knowledge is to 50
microradians. The
command and data handling...
-
better when
using beam
profilers over irises.
Applications that need
microradian alignment accuracies include earth-to-space communications, earth-to-space...
- Mars by JPL, the
Pancam system can
achieve an
angular resolution of 300
microradians,
which is
three times better than the
human eye. It can
observe 14 spectral...
-
stabilize a
projected laser beam to much
better than
several hundred microradians.
Buffeting due to
aerodynamic turbulence further degrades the pointing...
- 1⁄1000 of Earth's
rotation rate: 1 MERU = 0.015 degrees/hour ≈ 0.072921
microradian/second.
Sometimes used to
measure the
angular drift rate of an inertial...
-
largest ever
carried on a deep
space mission, and has a
resolution of 1
microradian, or 0.3 m (1 ft 0 in) from an
altitude of 300 km (190 mi). In comparison...
